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NetBSD/sys/scsi/st.c

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/*
* Written by Julian Elischer (julian@tfs.com)
* for TRW Financial Systems for use under the MACH(2.5) operating system.
* Hacked by Theo de Raadt <deraadt@fsa.ca>
*
* TRW Financial Systems, in accordance with their agreement with Carnegie
* Mellon University, makes this software available to CMU to distribute
* or use in any manner that they see fit as long as this message is kept with
* the software. For this reason TFS also grants any other persons or
* organisations permission to use or modify this software.
*
* TFS supplies this software to be publicly redistributed
* on the understanding that TFS is not responsible for the correct
* functioning of this software in any circumstances.
*
* $Id: st.c,v 1.10 1993/06/16 04:31:43 deraadt Exp $
*/
/*
* To do:
* work out some better way of guessing what a good timeout is going
* to be depending on whether we expect to retension or not.
*
*/
#include "st.h"
#include "sys/types.h"
#include "sys/param.h"
#include "sys/systm.h"
#include "sys/errno.h"
#include "sys/malloc.h"
#include "sys/ioctl.h"
#include "sys/buf.h"
#include "sys/proc.h"
#include "sys/user.h"
#include "sys/mtio.h"
#include "sys/dkbad.h"
#include "sys/disklabel.h"
#include "scsi/scsi_all.h"
#include "scsi/scsi_tape.h"
#include "scsi/scsiconf.h"
#include "scsi/stdefs.h"
long int ststrats, stqueues;
#define ST_RETRIES 4
#define UNITSHIFT 4
#define MODE(z) ((minor(z) & 0x03))
#define DSTY(z) (((minor(z) >> 2) & 0x03))
#define UNIT(z) ((minor(z) >> UNIT_SHIFT))
#undef NST
#define NST ( makedev(1,0) >> UNITSHIFT)
#define DSTY_QIC120 3
#define DSTY_QIC150 2
#define DSTY_QIC525 1
#define QIC120 0x0f
#define QIC150 0x10
#define QIC525 0x11
#define ESUCCESS 0
int st_debug = 0;
struct st_data *st_data[NST];
static int next_st_unit = 0;
/*
* The routine called by the low level scsi routine when it discovers
* A device suitable for this driver
*/
int
stattach(int masunit, struct scsi_switch *sw, int physid, int *unit)
{
struct st_data *st;
unsigned char *tbl;
int targ, lun, i;
targ = physid >> 3;
lun = physid & 7;
/*printf("stattach: st%d at %s%d target %d lun %d\n",
*unit, sw->name, masunit, targ, lun);*/
if(*unit==-1) {
for(i=0; i<NST && *unit==-1; i++)
if(st_data[*unit]==NULL)
*unit = i;
}
if(*unit >= NST || *unit==-1)
return 0;
if(st_data[*unit])
return 0;
st = st_data[*unit] = (struct st_data *)malloc(sizeof *st,
M_TEMP, M_NOWAIT);
bzero(st, sizeof *st);
st->sc_sw = sw;
st->ctlr = masunit;
st->targ = targ;
st->lu = lun;
/*
* Use the subdriver to request information regarding
* the drive. We cannot use interrupts yet, so the
* request must specify this.
*/
if( st_mode_sense(*unit, SCSI_NOSLEEP | SCSI_NOMASK | SCSI_SILENT))
printf("st%d at %s%d targ %d lun %d: %d blocks of %d bytes\n",
*unit, sw->name, masunit, targ, lun,
st->numblks, st->blksiz);
else
printf("st%d at %s%d targ %d lun %d: offline\n",
*unit, sw->name, masunit, targ, lun);
/*
* Set up the bufs for this device
*/
st->buf_queue.b_active = 0;
st->buf_queue.b_actf = 0;
st->buf_queue.b_actl = 0;
st->initialized = 1;
return 1;
}
/*
* open the device.
*/
int
stopen(dev_t dev)
{
int errcode = 0;
int unit, mode, dsty;
int dsty_code;
struct st_data *st;
unit = UNIT(dev);
mode = MODE(dev);
dsty = DSTY(dev);
st = st_data[unit];
/*
* Check the unit is legal
*/
if( unit >= NST )
return ENXIO;
if(!st)
return ENXIO;
/*
* Only allow one at a time
*/
if(st->flags & ST_OPEN) {
errcode = EBUSY;
goto bad;
}
/*
* Set up the mode flags according to the minor number
* ensure all open flags are in a known state
*/
st->flags &= ~ST_PER_OPEN;
switch(mode) {
case 2:
case 0:
st->flags &= ~ST_NOREWIND;
break;
case 3:
case 1:
st->flags |= ST_NOREWIND;
break;
default:
printf("st%d: bad mode (minor number) %d\n", unit, mode);
return EINVAL;
}
/*
* Check density code: 0 is drive default
*/
switch(dsty) {
case 0:
dsty_code = 0;
break;
case DSTY_QIC120:
dsty_code = QIC120;
break;
case DSTY_QIC150:
dsty_code = QIC150;
break;
case DSTY_QIC525:
dsty_code = QIC525;
break;
default:
printf("st%d: bad density (minor number) %d\n", unit, dsty);
return EINVAL;
}
if(scsi_debug & (PRINTROUTINES | TRACEOPENS))
printf("st%d: open dev=0x%x (unit %d (of %d))\n", unit, dev, NST);
/*
* Make sure the device has been initialised
*/
if (!st->initialized) {
/*printf("st%d: uninitialized\n", unit);*/
return ENXIO;
}
/*
* Check that it is still responding and ok.
*/
if (!(st_req_sense(unit, 0))) {
errcode = EIO;
if(scsi_debug & TRACEOPENS)
printf("st%d: not responding\n", unit);
goto bad;
}
if(scsi_debug & TRACEOPENS)
printf("st%d: is responding\n", unit);
if(!(st_test_ready(unit, 0))) {
printf("st%d: not ready\n", unit);
return EIO;
}
if(!st->info_valid) /* is media new? */
if(!st_load(unit, LD_LOAD, 0))
return EIO;
if(!st_rd_blk_lim(unit, 0))
return EIO;
if(!st_mode_sense(unit, 0))
return EIO;
if(!st_mode_select(unit, 0, dsty_code))
return EIO;
st->info_valid = TRUE;
st_prevent(unit, PR_PREVENT, 0); /* who cares if it fails? */
/*
* Load the physical device parameters
*/
if(scsi_debug & TRACEOPENS)
printf("st%d: params ", unit);
st->flags |= ST_OPEN;
bad:
return errcode;
}
/*
* close the device.. only called if we are the LAST
* occurence of an open device
*/
int
stclose(dev_t dev)
{
unsigned char unit, mode;
struct st_data *st;
unit = UNIT(dev);
mode = MODE(dev);
st = st_data[unit];
if(scsi_debug & TRACEOPENS)
printf("st%d: close\n", unit);
if(st->flags & ST_WRITTEN)
st_write_filemarks(unit, 1, 0);
st->flags &= ~ST_WRITTEN;
switch(mode) {
case 0:
st_rewind(unit, FALSE, SCSI_SILENT);
st_prevent(unit, PR_ALLOW, SCSI_SILENT);
break;
case 1:
st_prevent(unit, PR_ALLOW, SCSI_SILENT);
break;
case 2:
st_rewind(unit, FALSE, SCSI_SILENT);
st_prevent(unit, PR_ALLOW, SCSI_SILENT);
st_load(unit, LD_UNLOAD, SCSI_SILENT);
break;
case 3:
st_prevent(unit, PR_ALLOW, SCSI_SILENT);
st_load(unit, LD_UNLOAD, SCSI_SILENT);
break;
default:
printf("st%d: bad mode (minor number) %d (how's it open?)\n",
unit, mode);
return EINVAL;
}
st->flags &= ~ST_PER_OPEN;
return 0;
}
/*
* trim the size of the transfer if needed,
* called by physio
* basically the smaller of our min and the scsi driver's*
* minphys
*/
void
stminphys(struct buf *bp)
{
(*(st_data[UNIT(bp->b_dev)]->sc_sw->scsi_minphys))(bp);
}
/*
* Actually translate the requested transfer into
* one the physical driver can understand
* The transfer is described by a buf and will include
* only one physical transfer.
*/
int
ststrategy(struct buf *bp)
{
struct st_data *st;
struct buf *dp;
unsigned char unit;
unsigned int opri;
if (bp->b_bcount == 0)
goto done;
ststrats++;
unit = UNIT((bp->b_dev));
st = st_data[unit];
if(scsi_debug & PRINTROUTINES)
printf("\nststrategy ");
if(scsi_debug & SHOWREQUESTS)
printf("st%d: %d bytes @ blk%d\n", unit, bp->b_bcount, bp->b_blkno);
/*
* Odd sized request on fixed drives are verboten
*/
if((st->flags & ST_FIXEDBLOCKS) && bp->b_bcount % st->blkmin) {
printf("st%d: bad request, must be multiple of %d\n",
unit, st->blkmin);
bp->b_error = EIO;
goto bad;
}
stminphys(bp);
opri = splbio();
dp = &st->buf_queue;
/*
* Place it in the queue of disk activities for this tape*
* at the end
*/
while ( dp->b_actf)
dp = dp->b_actf;
dp->b_actf = bp;
bp->b_actf = NULL;
/*
* Tell the device to get going on the transfer if it's
* not doing anything, otherwise just wait for completion*
*/
ststart(unit);
splx(opri);
return;
bad:
bp->b_flags |= B_ERROR;
done:
/*
* Correctly set the buf to indicate a completed xfer
*/
iodone(bp);
return;
}
/*
* ststart looks to see if there is a buf waiting for the device
* and that the device is not already busy. If both are true,
* It deques the buf and creates a scsi command to perform the
* transfer in the buf. The transfer request will call st_done
* on completion, which will in turn call this routine again
* so that the next queued transfer is performed.
* The bufs are queued by the strategy routine (ststrategy)
*
* This routine is also called after other non-queued requests
* have been made of the scsi driver, to ensure that the queue
* continues to be drained.
*/
/* ststart() is called at splbio */
int
ststart(int unit)
{
struct st_data *st = st_data[unit];
register struct buf *bp = 0, *dp;
struct scsi_rw_tape cmd;
struct scsi_xfer *xs;
int drivecount, blkno, nblk;
if(scsi_debug & PRINTROUTINES)
printf("st%d: start\n", unit);
/*
* See if there is a buf to do and we are not already
* doing one
*/
xs = &st->scsi_xfer;
if(xs->flags & INUSE)
return; /* unit already underway */
trynext:
if(st->blockwait) {
wakeup(&st->blockwait);
return;
}
dp = &st->buf_queue;
if ((bp = dp->b_actf) != NULL)
dp->b_actf = bp->b_actf;
else
return;
xs->flags = INUSE; /* Now ours */
/*
* We have a buf, now we should move the data into
* a scsi_xfer definition and try start it
*/
/*
* If we are at a filemark but have not reported it yet
* then we should report it now
*/
if(st->flags & ST_AT_FILEMARK) {
bp->b_error = 0;
bp->b_flags |= B_ERROR; /* EOF*/
st->flags &= ~ST_AT_FILEMARK;
biodone(bp);
xs->flags = 0; /* won't need it now */
goto trynext;
}
/*
* If we are at EOM but have not reported it yet
* then we should report it now
*/
if(st->flags & ST_AT_EOM) {
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
st->flags &= ~ST_AT_EOM;
biodone(bp);
xs->flags = 0; /* won't need it now */
goto trynext;
}
/*
* Fill out the scsi command
*/
bzero(&cmd, sizeof(cmd));
if((bp->b_flags & B_READ) == B_WRITE) {
st->flags |= ST_WRITTEN;
xs->flags |= SCSI_DATA_OUT;
}
else
xs->flags |= SCSI_DATA_IN;
cmd.op_code = (bp->b_flags & B_READ) ? READ_COMMAND_TAPE : WRITE_COMMAND_TAPE;
/*
* Handle "fixed-block-mode" tape drives by using the *
* block count instead of the length.
*/
if(st->flags & ST_FIXEDBLOCKS) {
cmd.fixed = 1;
lto3b(bp->b_bcount/st->blkmin, cmd.len);
}
else
lto3b(bp->b_bcount, cmd.len);
/*
* Fill out the scsi_xfer structure
* Note: we cannot sleep as we may be an interrupt
*/
xs->flags |= SCSI_NOSLEEP;
xs->adapter = st->ctlr;
xs->targ = st->targ;
xs->lu = st->lu;
xs->retries = 1; /* can't retry on tape*/
xs->timeout = 100000; /* allow 100 secs for retension */
xs->cmd = (struct scsi_generic *)&cmd;
xs->cmdlen = sizeof(cmd);
xs->data = (u_char *)bp->b_un.b_addr;
xs->datalen = bp->b_bcount;
xs->resid = bp->b_bcount;
xs->when_done = st_done;
xs->done_arg = unit;
xs->done_arg2 = (int)xs;
xs->error = XS_NOERROR;
xs->bp = bp;
#if defined(OSF) || defined(FIX_ME)
if (bp->b_flags & B_PHYS) {
xs->data = (u_char*)map_pva_kva(bp->b_proc, bp->b_un.b_addr,
bp->b_bcount, st_window[unit],
(bp->b_flags&B_READ)?B_WRITE:B_READ);
} else
xs->data = (u_char*)bp->b_un.b_addr;
#endif /* defined(OSF) */
if ( (*(st->sc_sw->scsi_cmd))(xs) != SUCCESSFULLY_QUEUED) {
printf("st%d: oops not queued", unit);
xs->error = XS_DRIVER_STUFFUP;
st_done(unit, xs);
}
stqueues++;
}
/*
* This routine is called by the scsi interrupt when
* the transfer is complete.
*/
int
st_done(int unit, struct scsi_xfer *xs)
{
struct st_data *st = st_data[unit];
struct buf *bp;
int retval;
if(scsi_debug & PRINTROUTINES)
printf("st%d: done\n", unit);
if (! (xs->flags & INUSE))
panic("scsi_xfer not in use!");
if(bp = xs->bp) {
switch(xs->error) {
case XS_NOERROR:
bp->b_flags &= ~B_ERROR;
bp->b_error = 0;
bp->b_resid = 0;
break;
case XS_SENSE:
retval = st_interpret_sense(unit, xs);
if(retval) {
/*
* We have a real error, the bit should
* be set to indicate this. The return
* value will contain the unix error code*
* that the error interpretation routine
* thought was suitable, so pass this
* value back in the buf structure.
* Furthermore we return information
* saying that no data was transferred
*/
bp->b_flags |= B_ERROR;
bp->b_error = retval;
bp->b_resid = bp->b_bcount;
st->flags &= ~(ST_AT_FILEMARK|ST_AT_EOM);
} else if(xs->resid && ( xs->resid != xs->datalen )) {
/*
* Here we have the tricky part..
* We successfully read less data than
* we requested. (but not 0)
*------for variable blocksize tapes:----*
* UNDER 386BSD:
* We should legitimatly have the error
* bit set, with the error value set to
* zero.. This is to indicate to the
* physio code that while we didn't get
* as much information as was requested,
* we did reach the end of the record
* and so physio should not call us
* again for more data... we have it all
* SO SET THE ERROR BIT!
*
* UNDER MACH:(CMU)
* To indicate the same as above, we
* need only have a non 0 resid that is
* less than the b_bcount, but the
* ERROR BIT MUST BE CLEAR! (sigh)
*
* UNDER OSF1:
* To indicate the same as above, we
* need to have a non 0 resid that is
* less than the b_bcount, but the
* ERROR BIT MUST BE SET! (gasp)(sigh)
*
*-------for fixed blocksize device------*
* We could have read some successful
* records before hitting
* the EOF or EOT. These must be passed
* to the user, before we report the
* EOx. Only if there is no data for the
* user do we report it now. (via an EIO
* for EOM and resid == count for EOF).
* We will report the EOx NEXT time..
*/
bp->b_flags |= B_ERROR;
bp->b_error = 0;
bp->b_resid = xs->resid;
if((st->flags & ST_FIXEDBLOCKS)) {
bp->b_resid *= st->blkmin;
if( (st->flags & ST_AT_EOM)
&& (bp->b_resid == bp->b_bcount)) {
bp->b_error = EIO;
st->flags &= ~ST_AT_EOM;
}
}
xs->error = XS_NOERROR;
break;
} else {
/*
* We have come out of the error handler
* with no error code.. we have also
* not had an ili (would have gone to
* the previous clause). Now we need to
* distiguish between succesful read of
* no data (EOF or EOM) and successfull
* read of all requested data.
* At least all o/s agree that:
* 0 bytes read with no error is EOF
* 0 bytes read with an EIO is EOM
*/
bp->b_resid = bp->b_bcount;
if(st->flags & ST_AT_FILEMARK) {
st->flags &= ~ST_AT_FILEMARK;
bp->b_flags &= ~B_ERROR;
bp->b_error = 0;
break;
}
if(st->flags & ST_AT_EOM) {
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
st->flags &= ~ST_AT_EOM;
break;
}
printf("st%d: error ignored\n", unit);
}
break;
case XS_TIMEOUT:
printf("st%d: timeout\n", unit);
break;
case XS_BUSY: /* should retry -- how? */
/*
* SHOULD put buf back at head of queue
* and decrement retry count in (*xs)
* HOWEVER, this should work as a kludge
*/
if(xs->retries--) {
xs->flags &= ~ITSDONE;
xs->error = XS_NOERROR;
if ( (*(st->sc_sw->scsi_cmd))(xs)
== SUCCESSFULLY_QUEUED) {
/* don't wake the job, ok? */
return;
}
printf("st%d: device busy\n");
xs->flags |= ITSDONE;
}
case XS_DRIVER_STUFFUP:
bp->b_flags |= B_ERROR;
bp->b_error = EIO;
break;
default:
printf("st%d: unknown error category %d from scsi driver\n",
unit, xs->error);
}
biodone(bp);
xs->flags = 0; /* no longer in use */
ststart(unit); /* If there's another waiting.. do it */
} else
wakeup(xs);
}
/*
* Perform special action on behalf of the user
* Knows about the internals of this device
*/
int
stioctl(dev_t dev, int cmd, caddr_t arg, int mode)
{
struct st_data *st;
struct mtop *mt;
struct mtget *g;
unsigned int opri;
unsigned char unit;
register i, j;
int errcode=0, number, flags, ret;
/*
* Find the device that the user is talking about
*/
flags = 0; /* give error messages, act on errors etc. */
unit = UNIT(dev);
st = st_data[unit];
if(unit >= NST)
return ENXIO;
if(!st)
return ENXIO;
switch(cmd) {
case MTIOCGET:
g = (struct mtget *)arg;
bzero(g, sizeof *g);
g->mt_type = 0x7; /* Ultrix compat */
ret=TRUE;
break;
case MTIOCTOP:
mt = (struct mtop *)arg;
if (st_debug)
printf("[sctape_sstatus: %x %x]\n", mt->mt_op, mt->mt_count);
/* compat: in U*x it is a short */
number = mt->mt_count;
switch ((short)(mt->mt_op)) {
case MTWEOF: /* write an end-of-file record */
ret = st_write_filemarks(unit, number, flags);
st->flags &= ~ST_WRITTEN;
break;
case MTFSF: /* forward space file */
ret = st_space(unit, number, SP_FILEMARKS, flags);
break;
case MTBSF: /* backward space file */
ret = st_space(unit, -number, SP_FILEMARKS, flags);
break;
case MTFSR: /* forward space record */
ret = st_space(unit, number, SP_BLKS, flags);
break;
case MTBSR: /* backward space record */
ret = st_space(unit, -number, SP_BLKS, flags);
break;
case MTREW: /* rewind */
ret = st_rewind(unit, FALSE, flags);
break;
case MTOFFL: /* rewind and put the drive offline */
if((ret = st_rewind(unit, FALSE, flags))) {
st_prevent(unit, PR_ALLOW, 0);
ret = st_load(unit, LD_UNLOAD, flags);
} else
printf("st%d: rewind failed; unit still loaded\n");
break;
case MTNOP: /* no operation, sets status only */
case MTCACHE: /* enable controller cache */
case MTNOCACHE: /* disable controller cache */
ret = TRUE;
break;
default:
return EINVAL;
}
break;
case MTIOCIEOT:
case MTIOCEEOT:
ret=TRUE;
break;
}
return ret ? ESUCCESS : EIO;
}
/*
* Check with the device that it is ok, (via scsi driver)*
*/
int
st_req_sense(int unit, int flags)
{
struct scsi_sense_data sense;
struct scsi_sense scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = REQUEST_SENSE;
scsi_cmd.length = sizeof(sense);
if (st_scsi_cmd(unit, (struct scsi_generic *)&scsi_cmd,
sizeof(scsi_cmd), (u_char *)&sense, sizeof(sense),
100000, flags | SCSI_DATA_IN) != 0)
return FALSE;
else
return TRUE;
}
/*
* Get scsi driver to send a "are you ready" command
*/
int
st_test_ready(int unit, int flags)
{
struct scsi_test_unit_ready scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = TEST_UNIT_READY;
if (st_scsi_cmd(unit, (struct scsi_generic *)&scsi_cmd,
sizeof(scsi_cmd), (u_char *)0, 0, 100000, flags) != 0)
return FALSE;
else
return TRUE;
}
#ifdef __STDC__
#define b2tol(a) (((unsigned)(a##_1) << 8) + (unsigned)a##_0 )
#else
#define b2tol(a) (((unsigned)(a/**/_1) << 8) + (unsigned)a/**/_0 )
#endif
/*
* Ask the drive what it's min and max blk sizes are.
*/
int
st_rd_blk_lim(int unit, int flags)
{
struct st_data *st = st_data[unit];
struct scsi_blk_limits scsi_cmd;
struct scsi_blk_limits_data scsi_blkl;
st = st_data[unit];
/*
* First check if we have it all loaded
*/
if (st->info_valid)
goto done;
/*
* do a 'Read Block Limits'
*/
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = READ_BLK_LIMITS;
/*
* do the command, update the global values
*/
if (st_scsi_cmd(unit, (struct scsi_generic *)&scsi_cmd,
sizeof(scsi_cmd), (u_char *)&scsi_blkl, sizeof(scsi_blkl),
5000, flags | SCSI_DATA_IN) != 0) {
if(!(flags & SCSI_SILENT))
printf("st%d: read block limits failed\n", unit);
st->info_valid = FALSE;
return FALSE;
}
if (st_debug)
printf("st%d: block size min %d max %d\n", unit,
b2tol(scsi_blkl.min_length),
_3btol(&scsi_blkl.max_length_2));
st->blkmin = b2tol(scsi_blkl.min_length);
st->blkmax = _3btol(&scsi_blkl.max_length_2);
done:
if(st->blkmin && (st->blkmin == st->blkmax))
st->flags |= ST_FIXEDBLOCKS;
return TRUE;
}
/*
* Get the scsi driver to send a full inquiry to the
* device and use the results to fill out the global
* parameter structure.
*/
int
st_mode_sense(int unit, int flags)
{
struct st_data *st = st_data[unit];
struct scsi_mode_sense scsi_cmd;
struct {
struct scsi_mode_header_tape header;
struct blk_desc blk_desc;
} scsi_s;
/*
* First check if we have it all loaded
*/
if(st->info_valid)
return TRUE;
/*
* First do a mode sense
*/
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = MODE_SENSE;
scsi_cmd.length = sizeof(scsi_s);
/*
* do the command, but we don't need the results
* just print them for our interest's sake
*/
if (st_scsi_cmd(unit, (struct scsi_generic *)&scsi_cmd,
sizeof(scsi_cmd), (u_char *)&scsi_s, sizeof(scsi_s),
5000, flags | SCSI_DATA_IN) != 0) {
if(!(flags & SCSI_SILENT))
printf("st%d: mode sense failed\n", unit);
st->info_valid = FALSE;
return FALSE;
}
if (st_debug)
printf("st%d: %d blocks of %d bytes, write %s, %sbuffered\n",
unit,
_3btol((u_char *)&scsi_s.blk_desc.nblocks),
_3btol((u_char *)&scsi_s.blk_desc.blklen),
scsi_s.header.write_protected ? "protected" : "enabled",
scsi_s.header.buf_mode ? "" : "un");
st->numblks = _3btol((u_char *)&scsi_s.blk_desc.nblocks);
st->blksiz = _3btol((u_char *)&scsi_s.blk_desc.blklen);
return TRUE;
}
/*
* Get the scsi driver to send a full inquiry to the
* device and use the results to fill out the global
* parameter structure.
*/
int
st_mode_select(int unit, int flags, int dsty_code)
{
struct st_data *st = st_data[unit];
struct scsi_mode_select scsi_cmd;
struct {
struct scsi_mode_header_tape header;
struct blk_desc blk_desc;
} dat;
/*
* Set up for a mode select
*/
bzero(&dat, sizeof(dat));
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = MODE_SELECT;
scsi_cmd.length = sizeof(dat);
dat.header.blk_desc_len = sizeof(struct blk_desc);
dat.header.buf_mode = 1;
dat.blk_desc.density = dsty_code;
if(st->flags & ST_FIXEDBLOCKS)
lto3b(st->blkmin, dat.blk_desc.blklen);
/* lto3b( st->numblks, dat.blk_desc.nblocks); use defaults!!!!
lto3b( st->blksiz, dat.blk_desc.blklen);
*/
/*
* do the command
*/
if (st_scsi_cmd(unit, (struct scsi_generic *)&scsi_cmd,
sizeof(scsi_cmd), (u_char *)&dat, sizeof(dat),
5000, flags | SCSI_DATA_OUT) != 0) {
if(!(flags & SCSI_SILENT))
printf("st%d: mode select failed\n", unit);
#if 0
st->info_valid = FALSE;
return FALSE;
#endif
}
return TRUE;
}
/*
* skip N blocks/filemarks/seq filemarks/eom
*/
int
st_space(int unit, int number, int what, int flags)
{
struct st_data *st = st_data[unit];
struct scsi_space scsi_cmd;
/* if we are at a filemark now, we soon won't be*/
st->flags &= ~(ST_AT_FILEMARK | ST_AT_EOM);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = SPACE;
scsi_cmd.code = what;
lto3b(number, scsi_cmd.number);
if (st_scsi_cmd(unit, (struct scsi_generic *)&scsi_cmd,
sizeof(scsi_cmd), (u_char *)0, 0, 600000, flags) != 0) {
if(!(flags & SCSI_SILENT))
printf("st%d: %s space failed\n", unit,
(number > 0) ? "forward" : "backward");
st->info_valid = FALSE;
return FALSE;
}
return TRUE;
}
/*
* write N filemarks
*/
int
st_write_filemarks(int unit, int number, int flags)
{
struct st_data *st = st_data[unit];
struct scsi_write_filemarks scsi_cmd;
st->flags &= ~(ST_AT_FILEMARK);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = WRITE_FILEMARKS;
lto3b(number, scsi_cmd.number);
if (st_scsi_cmd(unit, (struct scsi_generic *)&scsi_cmd,
sizeof(scsi_cmd), (u_char *)0, 0, 100000, flags) != 0) {
if(!(flags & SCSI_SILENT))
printf("st%d: write file marks failed\n", unit);
st->info_valid = FALSE;
return FALSE;
}
return TRUE;
}
/*
* load /unload (with retension if true)
*/
int
st_load(int unit, int type, int flags)
{
struct st_data *st = st_data[unit];
struct scsi_load scsi_cmd;
st->flags &= ~(ST_AT_FILEMARK | ST_AT_EOM);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = LOAD_UNLOAD;
scsi_cmd.load=type;
if (type == LD_LOAD)
{
/*scsi_cmd.reten=TRUE;*/
scsi_cmd.reten=FALSE;
}
else
{
scsi_cmd.reten=FALSE;
}
if (st_scsi_cmd(unit, (struct scsi_generic *)&scsi_cmd,
sizeof(scsi_cmd), (u_char *)0, 0, 30000, flags) != 0) {
if(!(flags & SCSI_SILENT))
printf("st%d: %s failed\n", unit,
type == LD_LOAD ? "load" : "unload");
st->info_valid = FALSE;
return FALSE;
}
return TRUE;
}
/*
* Prevent or allow the user to remove the tape
*/
int
st_prevent(int unit, int type, int flags)
{
struct st_data *st = st_data[unit];
struct scsi_prevent scsi_cmd;
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = PREVENT_ALLOW;
scsi_cmd.prevent=type;
if (st_scsi_cmd(unit, (struct scsi_generic *)&scsi_cmd,
sizeof(scsi_cmd), (u_char *)0, 0, 5000, flags) != 0) {
if(!(flags & SCSI_SILENT))
printf("st%d: %s failed\n", unit,
type == PR_PREVENT ? "prevent" : "allow");
st->info_valid = FALSE;
return FALSE;
}
return TRUE;
}
/*
* Rewind the device
*/
int
st_rewind(int unit, int immed, int flags)
{
struct st_data *st = st_data[unit];
struct scsi_rewind scsi_cmd;
st->flags &= ~(ST_AT_FILEMARK | ST_AT_EOM);
bzero(&scsi_cmd, sizeof(scsi_cmd));
scsi_cmd.op_code = REWIND;
scsi_cmd.immed=immed;
if (st_scsi_cmd(unit, (struct scsi_generic *)&scsi_cmd,
sizeof(scsi_cmd), (u_char *)0, 0, immed?5000:300000, flags) != 0) {
if(!(flags & SCSI_SILENT))
printf("st%d: rewind failed\n", unit);
st->info_valid = FALSE;
return FALSE;
}
return TRUE;
}
/*
* ask the scsi driver to perform a command for us.
* Call it through the switch table, and tell it which
* sub-unit we want, and what target and lu we wish to
* talk to. Also tell it where to find the command
* how long int is.
* Also tell it where to read/write the data, and how
* long the data is supposed to be
*/
int
st_scsi_cmd(int unit, struct scsi_generic *scsi_cmd, int cmdlen,
u_char *data_addr, int datalen, int timeout, int flags)
{
struct st_data *st = st_data[unit];
struct scsi_xfer *xs;
int retval, s;
if(scsi_debug & PRINTROUTINES)
printf("\nst_scsi_cmd%d ", unit);
if(!st->sc_sw) {
printf("st%d: not set up\n", unit);
return EINVAL;
}
xs = &st->scsi_xfer;
if(!(flags & SCSI_NOMASK))
s = splbio();
st->blockwait++; /* there is someone waiting */
while (xs->flags & INUSE)
sleep(&st->blockwait, PRIBIO+1);
st->blockwait--;
xs->flags = INUSE;
if(!(flags & SCSI_NOMASK))
splx(s);
/*
* Fill out the scsi_xfer structure
*/
xs->flags |= flags;
xs->adapter = st->ctlr;
xs->targ = st->targ;
xs->lu = st->lu;
xs->retries = ST_RETRIES;
xs->timeout = timeout;
xs->cmd = scsi_cmd;
xs->cmdlen = cmdlen;
xs->data = data_addr;
xs->datalen = datalen;
xs->resid = datalen;
xs->when_done = (flags & SCSI_NOMASK) ? (int (*)())0 : st_done;
xs->done_arg = unit;
xs->done_arg2 = (int)xs;
retry:
xs->error = XS_NOERROR;
xs->bp = 0;
retval = (*(st->sc_sw->scsi_cmd))(xs);
switch(retval) {
case SUCCESSFULLY_QUEUED:
s = splbio();
while(!(xs->flags & ITSDONE))
sleep(xs,PRIBIO+1);
splx(s);
case HAD_ERROR:
case COMPLETE:
switch(xs->error) {
case XS_NOERROR:
retval = ESUCCESS;
break;
case XS_SENSE:
retval = st_interpret_sense(unit, xs);
/* only useful for reads */
if (retval)
st->flags &= ~(ST_AT_FILEMARK | ST_AT_EOM);
else {
xs->error = XS_NOERROR;
retval = ESUCCESS;
}
break;
case XS_DRIVER_STUFFUP:
retval = EIO;
break;
case XS_TIMEOUT:
case XS_BUSY:
if(xs->retries-- ) {
xs->flags &= ~ITSDONE;
goto retry;
}
retval = EIO;
break;
default:
retval = EIO;
printf("st%d: unknown error category %d from scsi driver\n",
unit, xs->error);
break;
}
break;
case TRY_AGAIN_LATER:
if(xs->retries--) {
xs->flags &= ~ITSDONE;
goto retry;
}
retval = EIO;
break;
default:
retval = EIO;
}
xs->flags = 0; /* it's free! */
ststart(unit);
return retval;
}
/*
* Look at the returned sense and act on the error and detirmine
* The unix error number to pass back... (0 = report no error)
*/
int
st_interpret_sense(int unit, struct scsi_xfer *xs)
{
struct st_data *st = st_data[unit];
struct scsi_sense_data *sense;
int silent = xs->flags & SCSI_SILENT, key;
/*
* If errors are ok, report a success
*/
if(xs->flags & SCSI_ERR_OK)
return ESUCCESS;
/*
* Get the sense fields and work out what CLASS
*/
sense = &(xs->sense);
if(st_debug) {
int count = 0;
printf("code%x class%x valid%x\n", sense->error_code,
sense->error_class, sense->valid);
printf("seg%x key%x ili%x eom%x fmark%x\n",
sense->ext.extended.segment, sense->ext.extended.sense_key,
sense->ext.extended.ili, sense->ext.extended.eom,
sense->ext.extended.filemark);
printf("info: %x %x %x %x followed by %d extra bytes\n",
sense->ext.extended.info[0], sense->ext.extended.info[1],
sense->ext.extended.info[2], sense->ext.extended.info[3],
sense->ext.extended.extra_len);
printf("extra: ");
while(count < sense->ext.extended.extra_len)
printf("%x ", sense->ext.extended.extra_bytes[count++]);
printf("\n");
}
switch(sense->error_class) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
if(!silent) {
printf("st%d: error class %d code %d\n", unit,
sense->error_class, sense->error_code);
if(sense->valid)
printf("block no. %d (decimal)\n",
(sense->ext.unextended.blockhi <<16),
+ (sense->ext.unextended.blockmed <<8),
+ (sense->ext.unextended.blocklow ));
}
return EIO;
case 7:
/*
* If it's class 7, use the extended stuff and interpret
* the key
*/
if(sense->ext.extended.eom)
st->flags |= ST_AT_EOM;
if(sense->ext.extended.filemark)
st->flags |= ST_AT_FILEMARK;
if(sense->ext.extended.ili) {
if(sense->valid) {
/*
* In all ili cases, note that
* the resid is non-0 AND not
* unchanged.
*/
xs->resid = ntohl(*((long *)sense->ext.extended.info));
if(xs->bp) {
if(xs->resid < 0) {
/* never on block devices */
/*
* it's only really bad
* if we have lost data
* (the record was
* bigger than the read)
*/
return EIO;
}
}
} else
printf("st%d: bad length error?", unit);
}
key = sense->ext.extended.sense_key;
switch(key) {
case 0x0:
return ESUCCESS;
case 0x1:
if(!silent) {
printf("st%d: soft error (corrected)", unit);
if(sense->valid) {
printf(" block %d\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
} else
printf("\n");
}
return ESUCCESS;
case 0x2:
if(!silent)
printf("st%d: not ready\n", unit);
return ENODEV;
case 0x3:
if(!silent) {
printf("st%d: medium error", unit);
if(sense->valid) {
printf(" block %d\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
} else
printf("\n");
}
return EIO;
case 0x4:
if(!silent)
printf("st%d: component failure\n",
unit);
return EIO;
case 0x5:
if(!silent)
printf("st%d: illegal request\n", unit);
return EINVAL;
case 0x6:
if(!silent)
printf("st%d: media change\n", unit);
st->flags &= ~(ST_AT_FILEMARK|ST_AT_EOM);
st->info_valid = FALSE;
if (st->flags & ST_OPEN) /* TEMP!!!! */
return EIO;
return ESUCCESS;
case 0x7:
if(!silent) {
printf("st%d: attempted protection violation",
unit);
if(sense->valid) {
printf(" block %d\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
} else
printf("\n");
}
return EACCES;
case 0x8:
if(!silent) {
printf("st%d: block wrong state (worm)", unit);
if(sense->valid) {
printf(" block %d\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
} else
printf("\n");
}
return EIO;
case 0x9:
if(!silent)
printf("st%d: vendor unique\n", unit);
return EIO;
case 0xa:
if(!silent)
printf("st%d: copy aborted\n", unit);
return EIO;
case 0xb:
if(!silent)
printf("st%d: command aborted\n", unit);
return EIO;
case 0xc:
if(!silent) {
printf("st%d: search returned", unit);
if(sense->valid) {
printf(" block %d\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
} else
printf("\n");
}
return ESUCCESS;
case 0xd:
if(!silent)
printf("st%d: volume overflow\n", unit);
return ENOSPC;
case 0xe:
if(!silent) {
printf("st%d: verify miscompare\n", unit);
if(sense->valid) {
printf("block no. %d (decimal)\n",
(sense->ext.extended.info[0] <<24)|
(sense->ext.extended.info[1] <<16)|
(sense->ext.extended.info[2] <<8)|
(sense->ext.extended.info[3] ));
} else
printf("\n");
}
return EIO;
case 0xf:
if(!silent)
printf("st%d: unknown error key\n", unit);
return EIO;
}
break;
}
return 0;
}
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